This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at https://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet.

What if applet does not run?

The applet could serve to demonstrate the Law of Cosines and also the fact that the centers of the squares constructed (externally) on the sides of a parallelogram form a square, which is known as one of V. Thebault's theorems.

References

1. R. Nelsen, Proofs Without Words, MAA, 1993, p. 19

• The Law of Cosines (Cosine Rule)
• The Illustrated Law of Cosines
• The Law of Sines and Cosines
• The Law of Cosines: Plane Tessellation
• The Law of Cosines: after Thâbit ibn Qurra
• The Law of Cosines: Unfolded Version
• The Law of Cosines (Independent of the Pythagorean Theorem)
• The Cosine Law by Similarity
• The Law of Cosines by Larry Hoehn
• The Law of Cosines - Another PWW
• The Law of Cosines - Yet Another PWW
• Law of Cosines by Ancient Sliding
• The Cosine Law: PWW by S. Kung

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